package string;

public class CharAtDemo {
    public static void main(String[] args) {
        String line = "0123456789abcdefghijklmnopqrstuvwsyzABCDEFGHIJKLMNOPQRSTUVWSYZ";
        char c = line.charAt((int) (Math.random()*62));
        System.out.println(c);
    }
}
